Heist: a Scheme interpreter in Ruby

Hi all,

Just a quick announcement that I’ve just released the first alpha
version of
Heist, a Scheme interpreter in Ruby. It’s currently fairly
arithmetic-focused, but it also has runtime support for some of the more
tricky stuff like tail recursion, macros and first-class continuations.
More
info on my blog, and on Github:

http://blog.jcoglan.com/2009/02/25/announcing-heist-a-new-scheme-implementation-written-in-ruby/

Feedback very much appreciated. I know people are forking it already,
and
while this is very gratifying I should point out I’m currently not
accepting
patches as I’m writing this mostly for my own education. Implementation
advice and literature will be very gratefully received, however.